Radio modem meant for the short-wave radio channels data transmitting

The radio modem meant for the functioning as part of short-wave radio station and it provides data transmitting between computers in the decametric waves range. The data transmitting protocol – the packet transmission using automated repeat request (ARQ).

The radio modem connection to computer is made via the port USB 2.0. The delivery set consists of special software, including necessary drivers and user interfaces meant for the radio modem control and the information displaying.

The radio modem connection to radio receiver is realized on intermediate frequency 128 kHz or 215 kHz.

The radio modem connection to radio transmitting device is realized on intermediate frequency 128 kHz.

Radio transmitting devices remote control is provided. The radio modem connection is performed via the standard telephone channel.

The main characteristics of the radio modem

№

The Identity of Characteristic

The parameter value

1

The operating modes:

1.1

The packet transmission in G1B mode:

speed rate, bits per second

100, 250, 500, 1200

1.2

The packet transmission in F1B mode:

speed rate, bits per second

100, 250, 500

1.3

Autonomous mode:

speed rate in G1B mode, bits per second

speed rate in F1B mode, bits per second

100, 250, 500, 1200

100

2

Technical characteristics

2.1

Power up readiness time to work, min

2

2.2

Error probability per bit during signal to noise level 5,5 dB when the speed rate is equal to100 bits per second

2.3

Error probability per bit during signal to noise level 8,5 dB when the speed rate is equal to 250 bits per second

2.4

The input signal level of radio receiving device on intermediate frequency 128 kHz or 215 kHz when loading is 75 ohm, mV

not less than 2

2.5

The input signal level of radio transmitting device on intermediate frequency 128 kHz when loading is 75 ohm, mV

180…220

2.6

Radio modem supply:

From the direct-current mains 27 V, From single-phase line 110 V 60Hz or 220 V 50Hz